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I haven't been able to open a window for about a month due to extreme air pollution outside, and I think my Senseair S8 is broken now. If it sees fresh air with
by 5e92cb50239222b 5y ago
I haven't been able to open a window for about a month due to extreme air pollution outside, and I think my Senseair S8 is broken now. If it sees fresh air with normal CO₂ levels it goes from "normal" 1.5-2k PPM (which are really closer to 4k) to zero and then shoots up to ~65000 PPM, and stays there. It spent the last two weeks in a room with an open window and still shows 65k PPM. Does anyone know of any way to recalibrate it, except for the obvious solution of putting it in a closed box and slowly lowering the amount of CO₂ there?
- janekm 5y agoThere is a calibration pin which you can connect to GND for 4-8s to force a manual calibration (if you can bring the sensor into an environment of ~400ppm): https://emariete.com/en/meter-co2-esp8266-nodemcu-sensor-senseair-s8/ https://emariete.com/en/meter-co2-esp8266-nodemcu-sensor-sen...
- ahaucnx 5y agoI think 65k ppm is outside the measurement range of the S8. It might be a communication or code issue that causes this and not from actual measurements.
- nemetroid 5y agoAccording to its datasheet, the S8 reports CO2 level as a 16 bit integer, so values around 2^16 (65535) sound like underflow issues.